Mercurial > dropbear

annotate libtommath/bn_mp_read_radix.c @ 1691:2d3745d58843

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try rearrange travis build matrix
author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 May 2020 23:27:26 +0800
parents f52919ffd3b1
children 1051e4eea25a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_READ_RADIX_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* read a string [ASCII] in a given radix */
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16 int mp_read_radix(mp_int *a, const char *str, int radix)
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17 {
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18 int y, res, neg;
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19 unsigned pos;
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20 char ch;
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21
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22 /* zero the digit bignum */
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23 mp_zero(a);
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24
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25 /* make sure the radix is ok */
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26 if ((radix < 2) || (radix > 64)) {
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27 return MP_VAL;
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28 }
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29
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30 /* if the leading digit is a
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31 * minus set the sign to negative.
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32 */
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33 if (*str == '-') {
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34 ++str;
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35 neg = MP_NEG;
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36 } else {
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37 neg = MP_ZPOS;
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38 }
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39
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40 /* set the integer to the default of zero */
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41 mp_zero(a);
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42
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43 /* process each digit of the string */
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44 while (*str != '\0') {
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45 /* if the radix <= 36 the conversion is case insensitive
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46 * this allows numbers like 1AB and 1ab to represent the same value
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47 * [e.g. in hex]
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48 */
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49 ch = (radix <= 36) ? (char)toupper((int)*str) : *str;
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50 pos = (unsigned)(ch - '(');
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51 if (mp_s_rmap_reverse_sz < pos) {
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52 break;
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53 }
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54 y = (int)mp_s_rmap_reverse[pos];
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55
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56 /* if the char was found in the map
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57 * and is less than the given radix add it
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58 * to the number, otherwise exit the loop.
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59 */
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60 if ((y == 0xff) || (y >= radix)) {
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61 break;
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62 }
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63 if ((res = mp_mul_d(a, (mp_digit)radix, a)) != MP_OKAY) {
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64 return res;
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65 }
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66 if ((res = mp_add_d(a, (mp_digit)y, a)) != MP_OKAY) {
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67 return res;
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68 }
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69 ++str;
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70 }
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71
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72 /* if an illegal character was found, fail. */
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73 if (!((*str == '\0') || (*str == '\r') || (*str == '\n'))) {
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74 mp_zero(a);
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75 return MP_VAL;
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76 }
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77
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78 /* set the sign only if a != 0 */
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79 if (mp_iszero(a) != MP_YES) {
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80 a->sign = neg;
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81 }
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82 return MP_OKAY;
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83 }
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84 #endif
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85
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86 /* ref: HEAD -> master, tag: v1.1.0 */
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87 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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88 /* commit time: 2019-01-28 20:32:32 +0100 */